A5034610676- Ecology and Vegetation Dynamics Studies
- Species Distribution and Climate Change
- Remote Sensing in Agriculture
- Plant and animal studies
- Botany and Plant Ecology Studies
- Insect and Arachnid Ecology and Behavior
- Rangeland Management and Livestock Ecology
- Coastal wetland ecosystem dynamics
- Land Use and Ecosystem Services
- African Botany and Ecology Studies
- Plant Water Relations and Carbon Dynamics
- Wildlife Ecology and Conservation
- Remote Sensing and LiDAR Applications
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Forest ecology and management
- Plant responses to water stress
- Ethnobotanical and Medicinal Plants Studies
- Marine Bivalve and Aquaculture Studies
- Mediterranean and Iberian flora and fauna
- Genetic diversity and population structure
- Pasture and Agricultural Systems
- Plant Parasitism and Resistance
- Conservation, Biodiversity, and Resource Management
- Ecosystem dynamics and resilience
Institute for Globally Distributed Open Research and Education
2023
Universität Hamburg
2012-2022
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2009-2012
University of North Carolina at Chapel Hill
2012
Abstract Question: How many vegetation plot observations (relevés) are available in electronic databases, how they geographically distributed, what their properties and might be discovered located for research application? Location: Global. Methods: We compiled the Global Index of Vegetation‐Plot Databases (GIVD; http://www.givd.info ), an Internet resource aimed at registering metadata on existing databases. For inclusion, databases need to (i) contain temporally spatially explicit species...
Wild plants are used as food for human populations where people still depend on natural resources to survive. This study aimed at identifying wild and edible uses known in four rural communities of the Pantanal-Brazil, estimating use value understanding how distance urban areas, gender, age number different environments available vicinity can influence knowledge these by local people. Data with were obtained through semi-structured interviews. A form standardized information was all order...
Abstract Drylands worldwide are exposed to a highly variable environment and face high risk of degradation. The effects global climate change such as altered precipitation patterns increased temperature leading reduced water availability will likely increase this risk. At the same time, an elevated atmospheric CO 2 level could mitigate by increasing use efficiency plants. To prevent degradation drylands, it is essential understand underlying processes that affect vegetation cover. Since...
The invasive shrub, Acacia longifolia, native to southeastern Australia, has a negative impact on vegetation and ecosystem functioning in Portuguese dune ecosystems. In order spectrally discriminate A. longifolia from other non-native species, we developed classification model based leaf reflectance spectra (350–2500 nm) condensed tannin content. High variation of content is common for Mediterranean shrub tree particular between N-fixing non-N-fixing as well within the genus, Acacia....
Hyperspectral remote sensing is an effective tool to discriminate plant species, providing vast potential trace invasions for ecological assessments. However, necessary baseline information the use of data missing many high-impact invaders. Furthermore, identification suitable classification algorithms and spectral regions successfully classifying species remains open field research. Here, we tested separability invasive tree Acacia longifolia from adjacent exotic native vegetation in a...
Abstract Questions: How can predictions of potential species distribution derived from presence‐only data and different modelling algorithms be compared evaluated? Where does suitable habitat for Juniperus oxycedrus exist within the study area which bioclimatic variables prove to most important in prediction J. distribution? Location: Central High Atlas, Morocco. Methods: Ecological niche factor analysis (ENFA), maximum entropy approach (MAXENT) generalized linear models (GLM) were applied...
Bush encroachment is a form of land degradation prominent worldwide, but particularly present in semi-arid areas. In this study, we mapped the spatial distribution two encroacher species, Acacia mellifera and reficiens,in Central Namibia, based on their different phenological behavior. We used constrained principal curves to extract one dimensional gradient change from hyperspectral images taken seasons. Field measurements species composition cover values were statistically related...
Linking remote sensing methodology to stable isotope ecology provides a promising approach study ecological processes from small large spatial scales. Here, we show that δ(15)N can be detected in fresh leaf reflectance spectra of field samples along gradient increasing nitrogen input an N2-fixing invasive species. However, data it is unclear whether directly influences or if the relationship based on covariation between and foliar content other properties. Using (15)N-labeling approach,...
Inundation and fire can affect the structure of riparian vegetation in wetlands. Our aim was to verify if there are differences richness, abundance, basal area, composition topographic preference woody species forests related history, flooding duration, or interaction between both. The study conducted Paraguay River some which were burned three times 2001 2011. We sampled trees with a girth at least 5 cm breast height 150 × 10 m plots (79 71 unburned). also measured flood mark estimated...
Abstract Edaphic habitat islands offer unique environmental conditions for plants and often harbour specialized floras, thus having high nature conservation value. Besides edaphic uniqueness, distinct spatial features landscape filters characterize islands. However, their role as drivers of biodiversity on remains unclear. We aim to quantify the extent which parameters (island shape characteristics, diversity) (insularity parameters, surrounding matrix effects) explain plant diversity...
Abstract In developing countries many people depend on woody resources for their livelihoods. Monitoring human impact the populations of socio‐economically important species is therefore conservation vulnerable plants. order to assess and compare population structure regeneration patterns three multipurpose species, namely Acacia seyal Del., Balanites aegyptiaca Delile Pterocarpus lucens Lepr. in four ethnic areas sub‐Sahel Burkina Faso (Samo, Gourmantché, Fulani Mossi), we used size‐class...
Abstract Questions Which plant traits consistently respond to grazing in different years and across habitat‐related environmental heterogeneity? Does the proposed partial RLQ approach allow partitioning of grazing‐related parameters from other temporal variations? Location Semi‐arid savannas central Namibia. Methods We recorded nine quantitative 12 categorical 87 species along gradients semi‐arid Namibian rangelands. sampled habitat settings 2 yr with differing total rainfall amounts. first...
ABSTRACT After decades of drought in the Sahel, several studies have reported a ‘(re)greening’ area. However, most these were based on large scale climatological or remotely sensed observations, with little no ground truthing. The aim this study was to assess local perceptions distribution socio‐economically important tree species Sub‐Sahel Burkina Faso. Semi‐structured interviews performed 87 groups informants from 20 villages belonging three ethnic (Mossi, Fulani and Samo). Univariate...
Hundreds of species in one Australia's dominant plant families, the Myrtaceae, are at risk from invasive pathogenic fungus Austropuccinia psidii . Since its arrival Australia 2010, native communities have been severely affected, with highly susceptible likely to become extinct recurring infections. While severe impact on Australian and plantation forestry has predicted, lemon myrtle industry is already under threat. Commercial cultivars ( Backhousia citriodora ) A. Detecting monitoring...
Abstract Aim Species–area relationships (SARs) are among the best investigated patterns in ecology, yet shape of function that should describe SARs and biological meaning parameters disputed. Elevational gradients offer opportunity investigating how biodiversity responds to large variations environmental characteristics within small geographical areas. We asked which describes at different elevations explored influence SAR shape. Location Alborz Mountains (Iran). Taxon Vascular plants....
Malaria belongs to the infectious diseases with highest morbidity and mortality worldwide. As a vector-borne disease malaria distribution is strongly influenced by environmental factors. The aim of this study was investigate association between risk different land cover classes using high-resolution multispectral Ikonos images Poisson regression analyses. incidence around 12 villages in Ashanti Region, Ghana, assessed 1,988 children <15 years age. median 85.7 per 1,000 inhabitants year...